I am currently passing information through the URL in a SPD application I have built. I have been following this tutorial (http://blogs.technet.com/b/brenclarke/archive/2009/04/14/creating-a-quiz-web-application-using-sharepoint-designer-part-2.aspx) but do not fully understand how I am passing information from one web part to another, or from one web page to another. I understand it is a query string, but am looking for more information regarding other options.
For example, this morning I checked the tracking of a UPS package from the home screen of the UPS site. I typed in the number on the home screen and was redirected to a different version of the same URL (I typed in the number on this page http://wwwapps.ups.com/WebTracking/track and was redirected to the same with my relavent information shown). If I were to build this process I would save the number as a parameter, insert it into the URL as a hyperlink, and pass it onto a unique page that would pull the data from other data locations (lists or databases) and observe it. What is UPS doing here? I assume it isn't passing information through the URL since my redirect is the same as the original, but I could be wrong. Please help with relevant links or information. Thank you!